Gear of a wrench



FIG. 1 is a perspective view of a gear of a wrench showing the claimed design;

FIG. 2 is a front elevational view thereof; the rear, right and left elevational views being identical with the front elevational view;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a cross-section perspective view showing the interior contours thereof. 

The ornamental design for a gear of a wrench, as shown and described. 